Hi @Dominic B,
Thanks for posting in the Lucid Community! Thank you for your help @Humas1985!
In addition to the information above, when you generate a share link with edit access to a Lucidchart document, the person you are sharing with does not need to have a license from you. As long as they have a Lucid account (at any subscription level), they can edit the document. If the person you are sharing with is at a lower account level, they will only have the features available at their account level. The only users who will not be able to edit any Lucidchart documents are limited-access users on an Enterprise account.
If you are generating a share link with edit access to a Lucidspark board, you have the option of generating a Guest Collaborator link. With a Guest Collaborator link, the person you are sharing with does not need neither a license or a Lucid account to edit your board. Limited-access users on an Enterprise account can be a Guest Collaborator on up to 5 Lucidspark boards per year.
Please let me know if you have any additional questions!